Hey,
I just want to present my project: Open-Volt (https://github.com/OlfillasOdikno/Open-Volt)
It is a collection of open-source tools (mostly written in java) I am creating for Re-Volt/RVGL.
All tools are written entirely from scratch.
Some tools have examples of what you could do.
Tools that are currently in the repository:

A library that aims to make it easier to work with Re-Volt files

A dedicated server for RVGL

A renderer for rendering cars and worlds

If you have any questions feel free to ask me.
And If you want to contribute please do so.
If you use any tool for a project please message me as well, because I am happy if my stuff gets used